Electric alarm-lock



(No Model.)

J. SLATER. ELECTRIC ALARM LOCK.

Patented Aug. 28, 1894.

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UNITED STATES PATENT OFFICE.

JOHN SLATER, OF HUTCHINS, PENNSYLVANIA.

ELECTRIC ALARM-LOCK..

SPECIFICATION forming part of Letters Patent No. 525,291, dated August28, 1894.

Application filed November 9,1893. Serial No. 490,480. (No model.)

To all whom, t may concern:

Be it known that I, JOHN SLATER, a citizen of the United States ofAmerica, residing at Hutchins, in the county of McKean and State ofPennsylvania, have invented certain new and useful improvements inElectric Alarm- Locks; and I do hereby declare the following to be afull, clear, and eXac-t description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and toletters or figures ot' reference marked thereon, which form a part ofthis specification.

The object of this invention is to provide a lock or latch of suchconstruction that when the spindle is not properly manipulated to engagethe latch-bolt for the purpose of retracting the same an elect-riccircuit is made or broken and sounds an alarm; and it consists in theconstruction of the lock and the connection of the wires thereto fromthe battery and bell, as will be hereinafter fully set forth andparticularly pointed out in the claims.

In the accompanying drawings, Figure l is a rear elevation of the lockor latch with the back plate removed. Fig, 2 is a perspective view,looking at the front part of the lock. Fig. 3 is a vertical sectionalview. Fig. 4t is a diagram view showing the manner of connecting thewires when the device is used with an open circuit, and Fig. 5 is adiagram View showing the connection of the wires with a closed circuit.

A designates the lock or latch casing in which is located aspring-actuated latch-bar B, the spring for projecting the latch-barencircling the pin h and bearing against the latch-bar and casing. videdwith an enlarged portion b having a recess 192 with which the lug c ofthe spindle C engages in retracting the bolt. The spindle projectsthrough the lock casing and is provided at its outer end with a knob Cfor turning the same.

The part of the device so far described forms an ordinary latch, and tosuch a latchl have shown my electric alarm mechanism applied.

Within the casing against the front plate The latch-bar B is prolthereof is attached a plate D of non-conducting material, asgutta-percha, and upon this plate is placed a metal plate E which isconnected to a post l extending without the casing and insulatedtherefrom by moans ot` the pieces e and e of gutta-percha.

Adjacent to the plate E and upon the gutta-percha plate D is secured ashort strip of metal F which is connected to a post 2 extending withoutthe casing and insulated therefrom the same as post l. The wires fromthe battery and bell are attached to the posts l and 2 when the deviceis to be used with a closed circuit, the contact between the plates Eand F to complete the electric connection being formed bya plate G whichis in contact with the plate E and has a projecting finger g in contactwith the metal strip F.

The plate G is pivoted to the plate E so that should the lug on thespindle be moved against the same it would be turned upon its pivot andthe contact of the finger g with the metal strip F would be broken andthe whole electric current pass into the bell (diagram Fig. 5). The endof the plate G opposite the iinger gis provided with a raised wall ghaving inwardly projecting portions q2 which when the finger is incontact with the plate Flie in the path of the lug cof the spindle whensaid lug is on a line therewith. Adjoining the plate G is a plate G',which is a duplicate of the plate G, having a raised wall g3 withprojections g4 and a nger g5, the inger projecting through the casing toprovide for operating the plates directly. The plates G and G areconnected to each other so as to move in unison by means of the teeth gGwhich are formed on each plate and are in mesh.

Between the plates G and G', out of possible contact therewith, and onthe opposite side of the spindle from the latch-bolt, is located a studh, upon which the lug on the spindle normally rests.

The knob C is provided with a pointer which indicates the position ofthe lug c, and

the knob is adjustable upon the spindle by means of the set-screw c2 sothat the position of the pointer with relation to the lug can bechanged, and in connection with the pointer is used a dial-plate A', asshown in Fig. 2.

IOC

Surrounding the spindle is a helical spring c3 which is interposedbetween the knob and casing to force the spindle outward.

To operate the latch-bolt Without sounding an alarm the spindle ispushed in until the lng; c thereon is out of line with theprojectingwalls on the plates G and G and the spindle turned until thesaid lue,` is over the recess b2 in the latch-bolt, indicated by thepointer and dial-plate,when it is caused to engage the recess and byfurther turning the spindle the latch-bolt will be retracted. Any oneunfamiliar with the construction of the lock turning the spindle wouldcause the lug to engage either the plate G or G and move the same,breaking; the circuit and sounding an alarm as hereinbefore described,and it Will be noted that with this connection should the Wires be cutin an attempt to manipulate the lock the breaking of the circuit wouldsound an alarm.

In providing,` the device with an open circuit a post 3 is attacheddirectly to the metal lock casing and the Wires from the battery andbell led thereto and to the post l, and with this connection the circuitis not completed to sound the alarm until the lug c of the spindle,which is electrically connected to the casingby means of said spindle,contacts with either one of the plates G and G', both of which areconnected to the post l as hereinloefore described.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. An alarm lock having an actuating` spindie With a lug which projectstherefrom, a bolt adapted to be moved by said lufr and spindle, togetherwith pivoted plates G and G having` inter-meshing teeth, said platesbeing connected to a binding-post and adapted to com tact with a platoinsulated therefrom and at tached to another binding-post, substantiallyas shown and for the purpose set forth.

2. In a lock Vfor the purpose set forth, the combination, of the pvotedplates G and G' insulated from the casing and electrically connected toa binding-post, as 1, and a metal plate F connected to a binding-post,as 2, together with a spindle having a lug which is adapted to engagewith one of said plates to open or close an electric circuit,substantially as shown and for the purpose set forth.

3. In an alarm lock, the combination with a lock casing and latch-boltoperating mechanism, a pivoted plate, or plates, G G', connected to abinding-post, as l, and a metal plate F insulated from the plate, orplates, G G and connected to a bindingpost, as f2, the mechanismoperating the latch bolt being adapted to move the plate, or plates, GG', to the plate, or plates, having;1 a projection which extends beyondthe casing', substantially as shown, and for the purpose set forth.

4. In combination with a lock casing,r ccnstructed substantially asshown and adapted to be used with an electric bell or alarm, of arotatable spindle C spring-actuated in one drection and provided With alug c, said lng beingl adapted to en gage with a latch-bolt and with astud h, the lug also being' adapted to engage with plate which isinsulated from the loci; casing, and electric connections, substantiallyas shown and for the purpose set forth.

In testimony whereof I aflix my signature in presence of two Witnesses.

' JOIIN SLATER.

.Vitnesses:

JOHN A. MELL, S. LEROY WmsLoW.

